Baron Samedi

{t}: All of your creatures on the battlefield
gain +2/+1.
{t}: Send all of your opponent's swamp
creatures to the graveyard.
{b}{b}: Send all of your opponent's
mountain creatures to the graveyard.
{r}{r}: Send all of your opponent's forest
creatures to the graveyard.
Behold, Baron Samedi, ruler of the midworld!